package com.lucy.management.utils;

import javax.servlet.http.HttpServletRequest;
import java.net.InetAddress;
import java.net.NetworkInterface;
import java.net.SocketException;
import java.util.Enumeration;

/** 
 * IP工具类 
 * @author geeksun 
 * 2011-9-23 
 */  
public class IpUtil {
    
    /** 
     * @param 获取远程IP 
     * @return IP Address 
     */  
    public static String getIpAddrByRequest(HttpServletRequest request) {  
        String ip = request.getHeader("x-forwarded-for");  
        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {  
            ip = request.getHeader("Proxy-Client-IP");  
        }  
        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {  
            ip = request.getHeader("WL-Proxy-Client-IP");  
        }  
        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {  
            ip = request.getRemoteAddr();  
        }  
        return ip;  
    }  
        
    /** 
     * @return 获取本机IP 
     * @throws SocketException 
     */  
    public static String getRealIp() throws SocketException {  
        String localip = null;// 本地IP，如果没有配置外网IP则返回它  
        String netip = null;// 外网IP  
    
        Enumeration<NetworkInterface> netInterfaces =   
            NetworkInterface.getNetworkInterfaces();  
        InetAddress ip = null;  
        boolean finded = false;// 是否找到外网IP  
        while (netInterfaces.hasMoreElements() && !finded) {  
            NetworkInterface ni = netInterfaces.nextElement();  
            Enumeration<InetAddress> address = ni.getInetAddresses();  
            while (address.hasMoreElements()) {  
                ip = address.nextElement();  
                if (!ip.isSiteLocalAddress()   
                        && !ip.isLoopbackAddress()   
                        && ip.getHostAddress().indexOf(":") == -1) {// 外网IP  
                    netip = ip.getHostAddress();  
                    finded = true;  
                    break;  
                } else if (ip.isSiteLocalAddress()   
                        && !ip.isLoopbackAddress()   
                        && ip.getHostAddress().indexOf(":") == -1) {// 内网IP  
                    localip = ip.getHostAddress();  
                }  
            }  
        }  
        
        if (netip != null && !"".equals(netip)) {  
            return netip;  
        } else {  
            return localip;  
        }  
    }  
        
} 